(PHP 5 >= 5.6.0, PHP 7)
gmp_rootrem — Take the integer part and remainder of nth root
gmp_rootrem ( GMP|int|string $num , int $nth ) : array
Takes the nth root of num and returns the integer component and remainder of the result.
num
A GMP object, an int or a numeric string.
nth
The positive root to take of num.
A two element array, where the first element is the integer component of the root, and the second element is the remainder, both represented as GMP numbers.
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https://www.php.net/manual/en/function.gmp-rootrem.php